On Mon, 15 Feb 2010, Ramya Desai wrote: > Dear All, > > Is there any performance tools available under Linux environment to > measure the performance of the mass storage drivers? Yes: hdparm, dd, and time. > Currently I am > using DD and hdparm commands to get the data transfer rates of my > device. By connecting my device to Windows I got lot of improvement in > data rates. > > Linux > -------- > dd if=/dev/sdb1 of=/home/testing/disk.Image bs=1G count=1 > 1073741824 bytes (1.1 GB) copied, 30.091 s, 35.7 MB/s It would be better to use "of=/dev/null" because then the outcome wouldn't be affected by the performance of the /home/testing device. > Windows (using Crystal Disk Mark performance measurement tool) > ------------------------------------------------------------------------------------------------- > I got 95.8 MB/s for the same device for 1 GB of data read. 95.8 MB/s is impossibly fast for a USB-2.0 transfer; the theoretical maximum bulk transfer rate is about 52 MB/s and actual rates are smaller. > My question is, why there is lot of difference between Windows and > Linux for the same device? As Greg said, it's because Linux and Windows were written by different people. > I am using xHCI controller and Sarah Sharp driver. Above you said you were interested in measuring the throughput of mass-storage drivers, so the controller driver you used is only partly relevant. What _mass-storage_ driver were you using? And what driver did you use under Windows? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
